Across the world, countless chilling and mysterious events involving demons, aliens, and supernatural phenomena have occurred—yet to this day, many of them remain unexplained.

1. The Devil’s Footprints

“Devil’s footprints” appeared in England and caused a stir in public opinion for a while.

This eerie event occurred in East Devon, England, in February 1855. After a heavy snowfall, locals discovered strange footprints stamped across the white snow. These prints formed a straight path stretching for miles, appearing on rooftops, water pipes, walls, and even haystacks. Some prints ended abruptly in desolate areas and vanished without explanation.

In 2009, similar “Devil’s footprints” reappeared in the snow, reigniting speculation. Some claimed it was a prank, while others believed they were literal traces of the devil himself.

2. The Dyatlov Pass Incident

In 1959, nine young Soviet hikers went missing during a skiing trip in the Ural Mountains of Russia. Their abandoned tent was found cut open from the inside, and their bodies were discovered scattered across the snow—some barefoot and lightly dressed despite the freezing cold.

The scene where the bodies of two students who died mysteriously while climbing were discovered.

The bodies of the first two students who died of hypothermia were found next to a tree. They died while trying to climb the tree. A week later, the bodies of the remaining seven were found. However, the strange thing is that the victims’ bodies had mysterious injuries such as a broken head, a missing tongue, and a buried body in white snow…

This tragic accident has caused investigators to have a headache searching for clues, but up to now, they have not found the cause of the incident. This story has become a big mystery. The place where these 9 students set up camp before they died is named “Dyatlov Pass”.

3. The Kelly-Hopkinsville Alien Encounter

Several witnesses reported that aliens visited the Kelly-Hopkinsville area in 1955.

In 1955, the people of Kentucky, USA were shocked by the visit of aliens to the Kelly-Hopkinsville area. Many witnesses, including state police and local police, reported to authorities about seeing aliens.

According to the witnesses, the aliens were 0.9m tall, with pointed ears, long nails, thin legs and arms. These extraterrestrial creatures were silver in color. Although they did not enter the house, the aliens appeared at the windows and doors, causing panic among the people inside. They immediately fled and called the police. Due to the lack of solid evidence, this is still a big mystery that puzzles humanity about whether aliens really exist or not.

4. The Atlas Vampire Murder

Lilly Lindestrom was a 32-year-old divorcee living in Stockholm in the 1930s. She lived in a small apartment and worked as a prostitute. On May 1, 1932, she was planning to celebrate May Day with her friend Minnie Jansson, a 35-year-old woman who lived in the same building and worked in the same profession. Lilly was nicknamed “the call girl” because she was the only person in the building with a telephone.

Lilly received a call from a potential client, asking if he could come to her place. Lilly agreed, so Minnie left. Minnie only saw her friend alive briefly that day, when Lilly went to borrow condoms. When Minnie knocked on Lilly’s door a few hours later, there was no answer. Minnie thought Lilly might have gone to celebrate May Day with the male client.

Lilly Lindestrom was found murdered in her home (Photo: Getty Images)

It was not until three days later that the police were called. When they broke in, Lilly was found face down on the bed, naked, with a condom still in her anus. She had been killed by three blows to the head with a blunt object. Her clothes were neatly folded next to her.

There were other puzzling details surrounding the murder. There was a large, bloody soup ladle in the room. Further investigation revealed that the blood had come from Lilly’s body, and that the killer had used the ladle to drink her blood. Despite the authorities’ efforts, details of the murder leaked out, and the local press dubbed the killer the Atlas Vampire, after the region where Lilly lived.

Eight of Lilly’s clients were investigated, but none were found to be suspects. Minnie did not recognize the voice she heard on the phone, but said the man was gentle and polite. There were no fingerprints or other suspicious objects left at the crime scene. One theory is that the killer may have been a police officer who beat Lilly with a baton and knew how to cover up the crime. Either way, the killer will forever remain a mystery.

5. The Green Children of Woolpit

In the 12th century, two children were found in Suffolk, England, with strange green skin and were believed to be aliens.

According to historian William of Newburgh, England, both children were found at the entrance of a wolf den during the harvest season. These children did not speak any language, their skin was green and they were dressed very strangely.

What shocked everyone was that the children did not eat any food for many days, until people gave them beans. Thanks to the beans, these two strange children lived for several months, until they learned to eat bread. After being baptized for a short time, the boy died, while the girl grew up, lost the green color on her skin and began to learn English.

The origin of the blue children remains a mystery.

The girl later explained that she and her brother came from an island with no sunlight, only very dim light sources. Many people believe that the two children came from St. Martin’s Island – an island that is completely blue. The girl did not understand why she and her brother got lost on this island. The girl was later named Agnes and married a royal named Richard Barre.

Many explanations have been given to explain this phenomenon. Some people believe that these “blue” children come from a secret world, connected to us by a wolf’s den. Others believe that the wolf’s den is a door leading to a parallel universe that exists with us. Many people believe that the two children are aliens who accidentally got lost on our planet.

The most plausible theory is that the incident took place in 1173, during the reign of King Henry II. During this time, Henry II ordered the hanging of Dutch immigrants and a series of wars took place. The person who proposed this theory, scholar Paul Harris, believes that these children lived in Forrnham St. Martin, a small village not far from Woolpit. After the village was destroyed and their parents were killed, the two children drifted to Thetford Forest and lived here without enough food. Therefore, they suffered from anemia. This is the cause of the blue pigment on their skin. These children may have heard the bells in Bury St. Graves and got lost in a section of a flint mine, dating back to the Stone Age, about 4,000 years ago.

This is why when they were discovered, the British thought they were aliens.

However, what is the truth behind this phenomenon is still an open question for us.

6. Who Put Bella in the Wych Elm?

There have been countless paintings, photographs, books and even songs inspired by the legendary case of “Who put Bella in the Wych Elm”, but the identity of the victim remains shrouded in mystery to this day.

It all started when a young boy named Bob Farmer and a few friends hung the body from an old elm tree on the old estate of Lord Cobham in 1943; the innocent children had no idea that they were about to ignite a mystery that would last for decades. Inside the dead and rotten trunk, the children found a human skull with only a few teeth and a tuft of hair remaining. Terrified, they agreed to put the find back in its place and never speak of it again, but one boy named Tommy Witells couldn’t take the pressure and told his parents.

The victim’s skull was found.

The police quickly got involved and found the rest of the body, which was only white bones covered by a few pieces of torn clothes; a gold wedding ring was still on one hand while the other hand was missing. All were scattered in the rotting trunk of a mountain elm. The woman was determined to be around 35 years old and had given birth once. Investigators believe she died of suffocation, and had been in the tree for at least a year; what made many people shiver was that investigators believe she was placed in the tree while still alive and then suffocated in the tree. The victim’s right hand was later found in the nearby area, and a piece of taffeta was also found in the victim’s mouth. Other than that, there was no other information about the victim, not even her name.

This mystery is 75 years old, longer than Bella would have lived if she had not died that day. Although the case has more or less reached a dead end, many people still hope that the identity of “Bella in the Elm” will be determined to ease the pain of the deceased.